SENSORY EVALUATION OF FOOD

Transcription

1 SENSORY EVALUATION OF FOOD

2 Influences on Food Preferences Physical: Issues that can affect the ability to detect flavors: Body chemistry Number of taste buds Age Gender

3 Influences on Food Preferences Psychological Taste bias is a like or dislike that is linked to past positive or negative experiences Label terms Brand names Advertising Peers Settings (depends on format of taste testing)

4 Influences on Food Preferences Cultural Beliefs and behaviors strongly influence exposures to food and resulting food preferences Religion/Religious Practices Lifestyle Holiday traditions

5 Influences on Food Preferences Environmental People are more likely to eat what is available and economical Geography Climate Food costs Obtainability Immediate surroundings affect food preferences Most children learn to like foods they are exposed to Preferences carry on into adulthood

6 Overcoming Taste/Food Bias Evaluating food goes far beyond like or dislike Train your taste buds Taste is a mental exercise Use culinary terminology Interpret food; don t just eat it

7 Scientifically testing food using the 5 basic senses: Sight Appearance Touch Texture Hearing Smell Aroma Taste

8 Appearance Appearance: Size, shape, condition, & color Example: Muffins Peaked, rounded, tunnels in inside, size of air cells, etc

9 Measuring Appearance A colorimeter is a device that measures the color of foods in terms of hue, value, and chroma Hue: Basic color Value: Lightness or darkness of that color Chroma: Intensity

10 Appearance Influences Color can influence a person s perception of other sensory characteristics Beverage Activity Colored lights may be used in a sensory evaluation to prevent color from influencing a taste panel

11 TEXTURE How food feels to the fingers, tongue, teeth, and palate (roof of the mouth) Mouthfeel Refers to the texture to the palate Texture is evaluated in terms of

12 TEXTURE Chewiness: How well 1 part of a food slides past another without breaking Taffy Pudding

13 TEXTURE Graininess: Refers to the size of the particles in a food product Whipped Cream Grits

14 TEXTURE Brittleness: How easily a food shatters or breaks apart Crackers Cake or Strawberries

15 TEXTURE Firmness: Food s resistance to pressure Tough foods require a considerable biting force to chew Beef Jerky Steak

16 TEXTURE Consistency: Thinness or thickness of a product Measured in terms of pourability Au Jus Beef Gravy

17 TEXTURE Preferences Remember texture preferences are very subjective Examples: French vs. American preferences in bread May like or dislike food based on texture alone

18 HEARING The sound a food makes when bitten or chewed Examples: Crisp Soggy

19 SENSE: TASTE FLAVOR Distinctive taste resulting from a food s combination of: Taste Aroma

20 TASTE BASED ON FIVE BASIC TASTES: 1. Sweet 2. Salty 3. Sour 4. Bitter 5. Umami (Savory)

21 Uma..what!? UMAMI (u-ma-me) Japanese term for delicious or savory Described as brothy or meaty Found in seafood, meats, vegetables and others

22 Ginger Shrimp and Watermelon Salad with Lemongrass Vinaigrette Vietnamese Spring Rolls with Sweet and Sour Fish Sauce Nishime (simmered chicken and vegetables)

23 Flow of Taste Buds Research indicates that a food s taste is related to the shape of the food s molecules Molecule of food matches to particular taste bud Nerve ending sends a message to the brain Brain knows which nerve impulse was sent from that particular taste bud

24 Factors Affecting TASTE Sour foods are evaluated in terms of ASTRIGENCY: The ability of a substance to draw up muscles in the mouth Mouth-puckering power of a food

25 Factors Affecting TASTE Flavor Enhancers : Open receptor sites on the tongue increasing stimulation. Increases flavor sensations & smooth out flavors Examples: MSG Mushrooms

26 Factors Affecting TASTE Temperature : Warmer food has more aroma & flavor Age: Babies have more sensitivity; decreases with age Taste blind Unable to distinguish taste Often a result of diseases and/or colds

27 SMELL Aroma Terminology Aroma: The odor of a food 20,000 different aromas

28 SMELL Aroma Volatile: Substances that contain particles that evaporate or become gaseous quickly Olfactory Bulb: Bundle of nerve fibers Located at the base of the brain Associates 1000 s of type of nerve stimulation with specific foods and/or experiences

29 SMELL Aroma Odor results from volatile particles coming in contact with the olfactory bulb The brain links various nerve stimulations with specific foods and experiences

30 Aroma Test 1. Waft the test tube containing the vanilla bean & cinnamon stick 2. Waft the test tube containing only the cinnamon stick 3. Waft the 1 st test tube again (containing both) What aroma(s) do you smell in the 1 st test tube the second time around? The nose only picks up CHANGE of smells Interesting Fact: Right handed people smell better with right nostril and vice versa

31 Volunteers Needed Must be willing to eat food without seeing it first 1. Plug nose 2. Close eyes 3. Chew 4. Open eyes (still not your nose) Results: Nose Pinched? Sweet & Chewy Nose Open? Retronasal allows for licorice taste to come through

32 Explain a chip to an alien Each group will receive 1 bowl of chips Using all of your senses, describe how you perceive your chips based on: Appearance Texture Hearing Flavor: Taste Aroma Be ready to explain your product as though someone has NEVER had a chip in their life!